dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 124
dp83261
Manufacturer Part Number
dp83261
Description
Bmac Device Fddi Media Access Controller
Manufacturer
National Semiconductor Corporation
Datasheet
1.DP83261.pdf
(132 pages)
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Appendix A Ring Engine State Machines
5 ED Actions
INC FRCT
SIGNAL FR Received
SET CILR FRRCV
IF Er
IF Er 4 R
i
If Valid Data Length
(FCr 4 Implementer and n(Option IFCS))
THEN RESET TVX
IF (A Flag
THEN INC EICT
S
Frame Received Ct
nE Flag
E Flag
THEN SET C Flag
ELSE SET E Flag
CLEAR A Flag
SET CILR FREI
THEN
l
(EA
EDRDVD
IF FCr 4 Claim
IF FCr 4 Beacon
IF FCr 4 Other MAC
IF FCr 4 VOID
Error Ct
Option EMIND))
M Flag
Frame Error Isolated
(Valid FCS Rc
THEN SET RELR CLM
THEN SET RELR BCN
THEN SIGNAL Other MAC
SET RELR OTRMAC
THEN
This E Flag is used during rest of the ED Actions
IF A Flag
IF H Flag
IF L Flag
IF M Flag
IF n(M Flag
IF M Flag
ELSE IF nA Flag
ELSE IF nM Flag
H Flag
VCOPY
124
THEN SIGNAL My Claim
THEN SIGNAL Higher Claim
THEN SIGNAL Lower Claim
THEN SIGNAL My Beacon
SET RELR MYBCN
CLEAR R Flag
THEN SIGNAL Other Beacon
SET RELR OTRBCN
CLEAR R Flag
SIGNAL My Void
SIGNAL Void
SIGNAL Other Void
l
L Flag
(FCr 4 Void)
M Flag
A Flag
l
(Continued)
E Flag)
SET RELR MYCLM
CLEAR R Flag
SET TNEG 4 T Bid Rc
SET RELR HICLM
CLEAR R Flag
SET TNEG 4 T Bid Rc
SET RELR LOCLM
CLEAR R Flag
nDAIG
l
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